Male Anatomy & Physiology

The Penis Composed mainly of spongy tissue Composed mainly of spongy tissue Becomes erect due to blood accumulation in its cylinders Becomes erect due to blood accumulation in its cylinders If relatively small when flaccid, likely to greatly expand when erect If relatively small when flaccid, likely to greatly expand when erect Enhanced at considerable risk Enhanced at considerable risk The glans (head) has many nerve endings The glans (head) has many nerve endings

More Penis Parts include: the glans, root, & spongy body Parts include: the glans, root, & spongy body Fractures only when erect and rarely Fractures only when erect and rarely Penile cancer is uncommon Penile cancer is uncommon Risk factors include long time tobacco use Risk factors include long time tobacco use Circumcision drops the odds somewhat Circumcision drops the odds somewhat

Circumcision Surgical removal of the foreskin Surgical removal of the foreskin Common, especially in North America Common, especially in North America Performed for religious or hygienic purposes Performed for religious or hygienic purposes Occasionally performed as a rite of passage Occasionally performed as a rite of passage White males whose mothers attended college are the most likely to endure White males whose mothers attended college are the most likely to endure

A Good Thing? American Academy of Pediatrics has gone back and forth on this American Academy of Pediatrics has gone back and forth on this Impact sexuality? Impact sexuality? Masters and Johnson said no Masters and Johnson said no NHSLS found more sexual problems with uncircumcised men NHSLS found more sexual problems with uncircumcised men

The Scrotum Pouch of skin beneath the groin which enclose the testes – (gonads) which produces sperm and sex hormones Pouch of skin beneath the groin which enclose the testes – (gonads) which produces sperm and sex hormones Normally hangs loose but retracts when cold or stimulated Normally hangs loose but retracts when cold or stimulated

The Delivery System To transport sperm, a long, thin duct, the vas deferens, draws sperm from the interior of each testes and then when sexually stimulated, channels the sperm around the bladder to the seminal vesicle to the ejaculatory duct where it is combined with other fluids to form semen To transport sperm, a long, thin duct, the vas deferens, draws sperm from the interior of each testes and then when sexually stimulated, channels the sperm around the bladder to the seminal vesicle to the ejaculatory duct where it is combined with other fluids to form semen

Does Size Matter? Penis size is a matter of great concern for many men. Does it really matter? Penis size is a matter of great concern for many men. Does it really matter? Vaginas are most sensitive in their outer portion. Vaginas are most sensitive in their outer portion. Some women find deep penetration painful. Some women find deep penetration painful. Size is not related to body shape, height, race, or anything else. Size is not related to body shape, height, race, or anything else.

The Final Word Women are no more sexually aroused by depictions of large penises than medium or small ones Women are no more sexually aroused by depictions of large penises than medium or small ones

Koro Formally known as Genital Retraction Syndrome, or shrinking penis Formally known as Genital Retraction Syndrome, or shrinking penis A cultural phenomenon of epic proportions A cultural phenomenon of epic proportions An ancient, bizarre rumor or delusion An ancient, bizarre rumor or delusion Primarily occurs in Asia and Africa Primarily occurs in Asia and Africa

No, I’m not kidding Men believe that they have caught a disease that causes their penis to shrink and retract into their body. Men believe that they have caught a disease that causes their penis to shrink and retract into their body. Like a turtle, koro (in Malaysian), retracts its head into its shell. Like a turtle, koro (in Malaysian), retracts its head into its shell. Then you die. Then you die.

Many Are Concerned Fear spreads like wildfire, wide spread panic breaks out, thousands and thousands are convinced they are infected. Fear spreads like wildfire, wide spread panic breaks out, thousands and thousands are convinced they are infected. They hang on with all they have. They hang on with all they have. “Penis thievery” outbreaks, violence, murder “Penis thievery” outbreaks, violence, murder

Stopping Koro Public education. Public education. Even public measuring (!) events. Even public measuring (!) events. An anxiety based delusion, similar to a contagious panic attack spread among vulnerable men with sexual guilt and anxiety An anxiety based delusion, similar to a contagious panic attack spread among vulnerable men with sexual guilt and anxiety